Tandem motor mechanism



NOV. 6, 1934. F. VAN DER WUDE 1,979,425

TANDEM MOTOR MECHANI SM Filed Aug. l2, 1951 ll Il lll irnanummmnmii mmnmuuwm1rl 44' 2 j g Z NVENTOR.

/C/-izz Van der Maur/e.

Patented Nov. 6, 1934 PATENT OFFICE TANDEM MOTOR MECHANISM Fritz van der Woude, Elyria, Ohio, assigner to The General Industries Company, Elyria, Ohio,

a corporation of Ohio Application August 12, 1931, Serial No. 556,526

19 Claims.

This invention relates to electric motor power delivering mechanisms.

My invention is applicable to numerous uses but I have chosen tov show and describe it in connection with a motor power delivering mechanism for operating turn-tables such, for example, as the turntable of phonographs.

It is one of the objects of my invention to` provide an improved motor mechanism which will be cheap to manufacture and efficient in operation.

Another object is to provide a motor mechanism composed of the minimum of parts and which parts may be assembled in a number of different arrangements whereby to optionally change the contour of the mechanism as a whole to adapt it to apparatus to be driven with which it may be associated.

Another object is to provide a motor mechanism in which a pair of motors may be employed to jointly drive a common power shaft such, for example, as the shaft of a turn-table and in an improved manner.

Another object is to provide an improved twin motor power-delivering mechanism.

Another object is to provide an improved motordrive and mounting therefor.

Another object is to provide an improved motor-drive and lubricating system therefor.

Another object is to provide an improved vibration-proof means for mounting a motor mechanism upon a cabinet or other supporting frame.

Another object is to provide an improved power-delivering mechanism adapted to be driven by electric motor power.

Other objects will be apparent to those skilled in the art to which my invention appertains.

My invention is fully disclosed in the following description taken in connection with the accompanying drawing, in which:-

Fig. 1 is a front elevational partly sectional view of an embodiment of my invention;

Fig. 2 is a sectional view taken from the plane 2 of Fig. 1;

Fig. 3 is a top plan view taken approximately from the plane 3 of Fig. 1; l'

Fig. 4 is an end View taken in the direction of the'arrow 4 of Fig. 1;

Fig. 5 is an end view taken in the direction of the arrow 5 of Fig. 1;

And Fig. 6 is a fragmentary sectional View taken from the plane 6 of Fig. 1.

Referring to the drawing, I have shown at 1 a main frame comprising a central box-like housing 2 comprising a bottom wall 3, end walls 4 and 5, front and rear walls 6 and 7, and a removable cover 8, and comprising also upper lateral extensions 9 and 10 extending from the wall 4 and lateral extensions 11 and 12 extending from the wall 5. Thus four extensions are provided on each side of the housing 2, namely two upper extensions 9 and two lower extensions 10 on one side, and two upper extensions 11 and two lower extensions 12 on the other side. The frame comprises also a pair of bearing bosses extending outwardly from the opposite side walls f1 and 5 of the housing, the bosses being provided with axially aligned bearing bores 14 and 15.

A vertical power-delivering shaft 16 is mounted in the housing 2, the lower end, as viewed in Fig. l, being of reduced diameter and rounded on the end as at 17, and disposed in a rotary bearing bore 18 in the bottom wall 3 of the housing and resting upon the square end of a plug 19 driven into the end of the bore to provide a supporting and end thrust bearing for the shaft 16.

Upwardly, the shaft 16 extends through a rotary bearing bore 20 in the housing cover 8, and externally thereof has secured thereon as by a set screw 21, a turntable or the like supporting head 22 surmounted by a rubber, vibration-absorbing washer 23.

When my invention is employed to drive the turntable of a phonograph, the turntable may rest upon the washer 23 and vibration which would otherwise be transmitted to the turntable is absorbed in the washer 23.

To prevent undue upward axial movement of the shaft 16, I provide the following means. A groove 24 is: turned in the shaft adjacent the under side of the cover 8; a U-shaped key 25 is straddled around the shaft in the groove, and a dishshaped washer 26 having a perforation in its bottom is telescoped over the shaft and with the :dange of the disc enclosing the key 25. End movements of the shaft 16 are thus stopped by the key and the disc 26 prevents accidental removing of the key. Upward end thrust of the shaft is thus received on the cover 8 and thus a simple and efficient means is provided for what in effect is a collar of relatively large diameter on the shaft 16.

Adjacent the lower end of the shaft 16 is a gear 27, preferably of fiber or' other composition material, press-fitted upon splines 28 to rigidly mount it on the shaft 16.

A motor shaft 29 is disposed in the bearing bores 14 and 15 and upon a portion thereof within the housing 2 has formed a worm thread 30 which is meshed with the teeth of the gear 27. 'Ihe shaft 29 extends outwardly beyond both of the bearing bosses 13-13 and on one end has rigidly mounted the armature 31 of an electric motor. On or adjacent the opposite end, another identical or similar armature 32 is mounted. The armature 31 may be press-fitted ont-o the shaft 29. Preferably the armature 32 is constructed with a central sleeve 33 telescoped upon the shaft tand the armature is rigidly secured to the shaft by a set screw 34 in the sleeve.

Thus in assembling the motor mechanism, the end of the shaft which supports the armature 32 may be passed through theV bearing bores 14 and. 15 successively and then the armature 32 telescoped thereon and secured thereto by the said screw 34.

Rotation yof the armatures 3l and 32 which rotate the shaft 29 as will be understood, rotatethe worm in the direction to cause it to react and thrust the'shaft 29 toward the end wall? 4 of the housing. To absorb this end thrust, a sleeve 35 is secured on the shaft 29 in the housing 2` by a set screw 36, the thrust thus being transferred to the inner face of the wall 4 of the housing.

A eld construction or stator for the armature 3l is provided comprising a pile of laminations 37 of the usual configuration and energizing windings 38 therefor, four of such windings 38- being provided and encircling suitable field poles 39-39.

The eld construction 37 as a unit is secured to the extension 9 and 10 by screws or bolts 40--40 projected through suitable aligned perforations in the laminations composing the field and screwed into threaded recesses in the ends of the extentions as, for example, at 41, Fig. 3.

An` end cover of sheet metal may be provided to cover the end of the motor and may be pressed from sheet metal. Preferably the cover 42 com-- lprises a bodyV portion 43 generally of circular 'form and a flanged face 44 generally rectangular to conform to the cross-sectional shape of the field 37,A and the screws or bolts may be projected through perforations 45 in the flange 44 whereby the screws may secure the cover 42. on the field. If desired, two, preferably diagonal perforations 45, may be enlarged to telescope over the heads of the screws or bolts 40. Thus two of the screws 40 may be left at all times tightly drawn up to permanently hold the field on the frame, and the other two screws may be removed when it is desired to remove the cover 42 for any purpose.

The cover may be provided in the body portion- 43 thereof with ventilation perforations 46-46.

A field 47 is provided for the armature 32,. generally of the same construction as the field 37, and having a plurality such as fou-r energizing windings 48 thereon. The lfield 47 is rigidly mounted Vupon the ends of the extensions 1l and l2 by double-ended studs having a head portion- 49 of hexagon or other wrench-engageable form and a shank portion 50 projected through holes or bores in the field and into threaded recesses as at 48 in the ends of the extensions and hav-i ing a short shank portion 51 extending outward.- ly from the head 49 for a purpose to be described.

n The shaft 29 extends outwardly'beyond the armature or rotor 32 and is associated. with a speed governing device of the friction type. vThe governing device may be of any knownor suitable construction but I prefer to employ a governing device suchas shown-and described in.

complete detail in my copending application, Serial No. 556,527, led August 12, 1931, patented Nov. 28, 1933, No. 1,936,924. This governing device cornprises a disc 53 supported on a sleeve 54 which is telescoped upon the free end of the shaft 29. A centrifugal device shown generally at 55- operates,A upon rota-tion of thev shaft 29, to move the disc 53 in the direction away from the rotor 32 by sliding the sleeve 54 on the shaft. A stationary friction annulus 56 of felt or like friction material is supported in a cup 57 secured by its bottom portion to a flat spring 58 mounted upon an end wall 59 of a housing to be more full-y described. A ball 60, lodged in a suitable recess 6l in the wall 59 of the housing, is adapted to bemoved axially inwardly by a cam 62 to move the cup 57 and annulus 56 to adjustably varythe friction on the plate 53 and to be moved outwardly by retraction of the spring 58 upon movement of the cam 62 to release its pressure on the ballv 60. Thus by means of the cam` 62 the governing friction may be regulated tovary the governing speed. The' cama 62 is in: the form of an eccentric the periphery of which engages the ball 60, the eccentric' being mounted upon a shaft 63 mounted in. bearings 64- and 65 on the end wall 59 of the housingand. terminating at the end opposite the cam 62y in a lever handle 66` having at its end a pointer 67 adapted to engage withV a scale not' shown to indicate the: adjustment of the governor.

The: above-mentioned end wall 59v of the housing has formed therewith a plurality such as four arms 68-68 extending inwardly toward the rotor 32- and terminating in feet 69-69V which have perforations therein suitable to be telescoped over the shank 51-51 of the studs 501 whereupon nuts 70 may be screwed on the shank to cla-mp the feet upon the stud head 49c and thu-s rigidly mount they governor housing in position.

Preferably the shaft 63 extends upwardly parallel to they power shaft 16 and is pressed. upwardly with the cam 62 engaging the lower endof the bearing 64 by a compression spring 7l reacting againstthe-upper end of the bearing. and against a cotter or other pin 72 projected through the shaft 63.

For mounting the motor units above described upon the wall of a cabinet or other supporting frame, the following means is provided.

Studs having each a shank 8l, a head 82t and a flange 83 superposed on the head 82 are provided and projected downwardly as showniin Fig. l through suitable bores in the extensions 9-9 and 11-11, the sha-nhs 8l extending through the bores and on the under sides of the extensions having each a nut 84 for securing them rigidly in position. A cylindrical block. of rubber 85 has formed in its opposite ends recesses, generally circular around the axis of the cylinder, and in cross-section of T-shape. The T- shaped recess in one end is forced over the flange 83 of the stud 80'-, the dimensions and proportions of the recess being such as to substantially lit with constricting tension the head 82 and ange 83 of the stud. Thus the flange 83 is interlocked with the material of the rubber-block 85. Into the T-shaped recess in the opposite end "ably inserting the flange 88 and head 87 into the T-shaped recess of the block. The shank 89 of thevstud 86 is, or may be, thus axially aligned lil() with the shank 81 of the stud 80. The block 85 is thus rmly secured to the extension and the stud 86 is secured to the block 85. The studs 89 may be inserted through suitable perforations in fa Wall of a cabinet or like supporting frame and nuts may be applied to the ends of the studs and the entire motor unit above described may thus be secured or connected to the panel, the connection being through the rubber blocks 85, and with a supporting connection of this kind, all vibration in the motor unit will be absorbed in the blocks 85 and not transmitted to the studs 86 nor to the cabinet wall to which they are secured.

A portion of a cabinet wall is indicated at 90 in connection with one of the studs 86 in Fig. 1, Where as shown, the cabinet wall 90 may be securely clamped between a nut 91 on the stud and the head 87 of the stud.

In order to lubricate the gears 27 and 30 and the shaft 29 in the bearing bores 14 and 15, lubricant may be supplied to partially ll the housing 2. Lubricant will work its way out along the shaft 29 into both bearing bores to lubricate the same and any excess will be returned into the housing or chamber 3 thereof by the action of a right-hand spiral groove 100, Fig. 2, cut in the shaft and disposed thereon within the bearing bore 15, and a corresponding left-hand groove 101 cut in the shaft where it rotates in the bore 14. Thus lubricant is supplied continuously and automatically to the wearing parts including the thrust bearing 17-18-19 above described.

Lubricant may be conveniently supplied through a tube 102 depending downwardly into the chamber 3 from the cover 8, the upper end of the tube providing an orice in which the lubricant such as oil may be admitted to the chamber 3. By terminating the tube 102 at a point above the level of lubricant in the chamber, the lubricant is prevented from running out of the chamber or leaking out therefrom in the event that the entire motor unit is turned up-sidedown as, for example, during transportation.

By disposing the shaft 63 of the governing mechanism parallel to the shaft 16 of the turntable head, the regulating lever 66 will conveniently be disposed on the upper side of the same panel or frame element above which the turntable rotates.

It is sometimes desirable to manufacture powerdelivering units of the above described type for the manufacturers of the apparatus to be driven thereby. The driven apparatus, designed and made by different manufacturers, may differ so much in arrangement and design that different arrangements of the power unit may be necessary to properly fit into the driven apparatus.

It is one of the important advantages of my invention that the parts of which the power unit is composed may be assembled in different arrangements, whereby variously arranged power units may be assembled from a single set of parts, thus making it possible to manufacture the parts in great quantities which tends to cheaper production of the nally assembled various units.

In carrying out this idea, it will be observed that the entire governing .mechanism which is shown on one end of the unit may be taken off and put on the other end of the unit and correspondingly the cover plate 42 on the said other end may be taken oi and put on the end occupied by the governing mechanism in the drawing.

In this connection, it is only necessary to assemble the shaft 29 and the armatures in the reverse direction, that is to say, positionally turned through 180.

Again, by supporting the unit on four studs 86, the said studs may be equally spaced and thus the unit may be secured to the panel of the driven apparatus in any one of four different positions around an imaginary axis within the square described by the studs; thus positioning the governing lever 66 in any one of four optional positions.

Again, by disposing the shaft of the turntable, 16, within the square described by the studs 86 asymmetrically thereto, the greater volume of the unit may be disposed at one side or the other of the shaft 16 by rotating the entire unit through 180.

Again, by employing two similar or twin motors, comprising the fields and armatures or rotors above described, a predesired amount of power may be delivered from a unit which is of relatively small dimension in the direction transverse to the axis of the motor; and furthermore, parts of the unit such as the fields, armatures, windings, etc.. may be employed which are also available for use in other types of powerdelivering units employing only a single motor of the same size.

My invention is not limited to the exact details of construction shown and described. Many changes and modifications may be made within the scope and spirit of my invention without sacrificing its advantages.

I claim:-

1. In a motor drive mechanism, a frame comprising a closed lubricant tight chamber, a driven shaft disposed generally vertically in the chamber, an end thrust bearing in a chamber Wall supporting the shaft, the shaft extending upwardly out of the chamber through a rotational bearing in an upper chamber wall, a gear on the shaft in the chamber, an armature shaft extending transversely through the chamber supported in rotational bearings in opposite walls thereof, a worm on the shaft meshed with the gear, and an armature on each end of the shaft lf' externally of the chamber, and lubricant in the chamber.

2. In a motor drive mechanism, a frame comprising a closed lubricant tight chamber, a driven shaft disposed generally vertically in the chamber, an end thrust bearing in a chamber wall supporting the shaft, the shaft extending upwardly out of the chamber through a rotational bearing in an upper chamber Wall, a gear on the shaft in the chamber, an armature shaft extending transversely through the chamber supported in rotational bearings in opposite walls thereof, a worm on the Ashaft meshed with the gear, an armature on each end of the shaft externally of the chamber, lubricant in the chamber, and a combined lubricant supply tube and breather pipe depending from a chamber upper wall into the chamber.

3. In a motor drive mechanism, a main frame, a substantially vertically driven shaft rotatably supported in the frame, a gear on the shaft, a substantially horizontal driving shaft, a worm on the driving shaft engaged the gear, a pair of motor rotors on the shaft on opposite sides of the worm, a stator for each rotor secured to the frame, a speed governor housing secured to one stator` and a speed governing mechanism in the housing, comprising a stationary portion secured to the housing and a rotary portion secured to a portion of the shaft.

4. In a motor drive mechanism, a main frame,

a. substantially vertically driven shaft. rotatably supported in the frame, a gear onV the. shaft, a. substantially'horizontal driving shaft, a worm on the driving shaft engaged with the gear, a-pair of motor rotors on the shaft on opposite sides. of the worm, a stator for eachrotor secured to the frame, a speed governor housing' secured to one stator and a speed governing mechanism in the housing, comprising a stationary portion secured to the housing, a rotary portion securedv to a portion of the shaft,` and a governor adjusting. shaft in the. governor housing disposed parallel to the. said driven shaft.

5. In a. motor drive mechanism, a. main frame a substantially vertical driven shaft rotatably supported in the frame, a gear on the shaft,l a substantially horizontal ldriving shaft, a gear on the driving shaft meshed with the gear on the driven shaft,I a pai-r of motor rotors on the shaft on'opposite sides of the said gear, astator for each rotor secured to the frame, a speed governor housing, secured to oneI stator, a speed governor mechanism in the housing, an. end cover on the other stator,` the housing and end cover being se cured to their stators by identically spaced holding devices whereby the driving shaft may be turned` end for end and the housing and cover interchanged. with each other.

6.V In a motor drive mechanism, a main frame comprising a central4 closed chamber, arms extending laterally from the.y chamber inopposite. directions, a pair of motor stators mounted upon the ends of the arms, one on each side of the chamber, a rotor shaft extending laterally through. the chamber and supporting at opposite ends a4 pair of rotors. associated with theV stators,v bearings for the shaftv in opposite walls of the chamber, a` driven shaft extending out of the chamber and, interiorlyV thereof, geared to the rotor shafty and having bearing supportsA in the chamber wall.

'7. In a motor drive mechanism, a main frame comprising a. central closed chamber, arms extending laterally from the chamber in opposite di-vrections, a pair-of motor stators mounted upon the vends of the arms, one on each side of the chamber, a rotor shaft extending laterally through the chamber and supporting at opposite ends a pair of rotors associated with the stators,v bearings for the shaft in opposite Walls of the. chamber,I a driven shaft extending out of the chamber, and, interiorly thereof, geared to the rotor shaft and having bearing supports in the chamber wall, and a speed governor comprising a rotating element on the rotor shaft beyond one of the stators and a stationary element supported in a governor housing, the governor housingl being secured; to said stator;

8. In a,4 motor drive mechanism, a main frame comprising a central closed chamber, arms ex-l tending laterally from the chamber in opposite directions, a pair of motor stators mounted upon the ends of the arms, one on. each side of the chamber, a rotor shaft extending laterally through 'the chamber and supporting at opposite ends a pair of rotors associated with the stators, bearings for the shaft in opposite walls of the chamber, a driven shaft extending out of the chamber, and,` interiorly thereof, geared to the rotor shaft and having bearing supports in the chamber wall, and a plurality of spaced attaching devices in a` common plane on the frame whereby the frame may be secured to a support in any one of a plurality of relatively rotated positions around an axis perpendicular to the plane.

9.y In a motor drive; mechanism,v a. main frame. comprising a generally central chamber, a pairy of motors supported on the frame and disposed at opposite sides of the chamber, a common motor shaft extending through thechamber, a powerdelivery shaftv extending out of, the chamber, disposed at an angle to the motor shaft. and laterally offset therefrom, and. transmission connections between the shaftsv disposed in the chamber and lubricant inthe chamber.

10. In an electric motor drive mechanism, a frame comprising a lubricating chamber, a rotatably supported drive shaft. extending through the chamber, a rotatably supported drivenyshaft in the chamber disposed at an angle tothe drive shaft and extending upwardly out ofthe chamber, a gear on the driven shaft in the chamben, a gear on the drive shaft meshed therewith, a pair of motor rotors fixed to the drive shaft onopposite sides of` the chamber and a cooperative: pair of motor stators supported on the frame.

11. An electric motor drive mechanism as described in claim 10 and in which the stators-are supported on lateral walls of the chamber.

12. An electric motor drive mechanism as ,des scribed in claim l0 and in which the drive shaft, rotates in lubricant in the chamber and extends through elongated bearing boresv in opposite walls 105 of the chamber. l

13. An electric motor drive mechanism as described in claim 10v and in which the stators are supported on the chamber wall and i-nspaced relation thereto, and the. drive shaft rotatesin H0 lubricant in the chamber and extends through elongated bearing bores in opposite lateral` walls of the chamber.

14. In an electric motor drive. mechanism, a frame comprising a lubricant containing chamm5 ber, a drive shaft extending through the cham,- ber,v a drive, shaft extending through the chamber supported in rotational bearings, a driven shaftextending upwardly out of the chamber disposed at an angle to the drive shaft, geared thereto, m9 andk having an end thrust supporting bearing in the chamber, a pair of motor stators supported. on the frame at opposite sides of the chamber, a pai-r of motor rotors cooperating therewith fixed on opposite end portions of the drive shaft, aspeed 12,5 governor mechanism comprising a mechanism element rotatable with the drive shaft, a mechanism support, and a stationary mechanism element on the mechanism support, and means for supporting the mechanism support alternatively in either of two positions to effect driving of the governor mechanism by either of the opposite end portions of the shaft, and means. on thev frame for securing the frame to a support.

15. In a motor drive mechanism, amain frame, aa driven shaft rotatably supported on the frame, a gear on the shaft, a driving shaft, a gear on the driving shaft meshed. with the gear onthe driven shaft a pair of motor rotors on thef shaft on opposite sides of the said gear, a stator for each rotor secured to the frame, a speed governor frame supported on one stator, a speed governor mechanism associated with the driving shaft supported on the frame, the. stators provided. with substantially duplicate holding means whereby the driving shaft may be turned end for end and the governor mechanism and governor frame. interchangeably asosciated with oppositev stators.

16. In a motor drive mechanisma main frame,

a driven shaft rotatably supported on the frame, 15.3.

a gear on the shaft, a driving shaft, a gear on the driving shaft meshed with the gear on the driven shaft, a pair of motor rotors on the shaft on opposite sides of the said gear, a stator for each rotor secured to the frame, a driving shaft speed governor mechanism comprising a mechanism supporting frame associated with a projecting end portion of the driving shaft, and substantially duplicate spaced frame securing and supporting means, whereby the driving shaft may be turned end for end and the governor and governor frame correspondingly interchangeably secured and supported to cooperate with the shaft in either position thereof.

17. In a motor drive mechanism, a main frame comprising a central closed chamber, supports on opposite sides of the chamber, a pair of motor stators mounted upon the supports one on each side of the chamber, a rotor shaft extending laterally through the chamber and supporting at opposite ends a pair of rotors associated with the stators, bearings for the shaft in opposite walls of the chamber, a driven shaft extending out of the chamber and, interiorly thereof, geared to the rotor Shaft and having bearing supports in the chamber wall.

18. In an electric motor drive mechanism, a frame comprising a lubricating chamber, a rotatably supported drive shaft extending through the chamber, a rotatably supported driven shaft in the chamber disposed at an angle to the drive shaft and extending upwardly out of the chamber, a gear on the driven shaft in the chamber, a gear on the drive shaft meshed therewith, a pair of motor rotors xed to the drive shaft on opposite sides of the chamber, a cooperative pair of motor stators supported on the frame, and conduit means depending into the chamber from an upper wall portion thereof and communicating with the interior of the chamber.

19. In a motor drive mechanism, a main frame comprising a central closed chamber, supports on opposite sides of the chamber, a pair of motor stators mounted upon the supports one on each side of the chamber, a rotor shaft extending laterally through the chamber and supporting at opposite ends a pair of rotors associated with the stators, bearings for the shaft in opposite walls of the chamber, a driven shaft extending out of the chamber and, interiorly thereof, geared to the rotor shaft and having bearing supports in the chamber wall, lubricant in the chamber, and a generally vertically disposed tube depending into the chamber from an upper wall portion thereof and at its lower end terminating above the level of lubricant in the chamber.

FRITZ VAN DER WOUDE. 

